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First you should have foot X-rays to check for any metatarsal bone fracture. This is possible from bone loss ( osteopenia for example). Next possibility can be an inflammatory condition like gout due to the high uric acid level commonly seen in cancer survivors. Rheumatoid arthritis is another condition that can affect your foot. Blood tests like uric acid level, sed rate, rheumatoid factor, anti CCP levels should be checked. A rheumatologist should be consulted with. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/